The X-Files: Darkness Falls is a novella written by Lex Martin. It was first published in 1995.
Description[]
Agents Mulder and Scully are tracking terror deep in the forest, where loggers have been disappearing into thin air. Is this the work of eco-warriors, trying to protect their beloved trees? Or an unearthly evil, indulging in a feeding frenzy every night, when the light fails?
One thing is certain: Scully and Mulder need answers before darkness falls...for good.